jdbm.recman

Class Magic

java.lang.Object

jdbm.recman.Magic

public final class Magic
extends java.lang.Object

This interface contains magic cookies. Final reference -> class shouldn't be extended

Field Summary

Fields

Modifier and Type	Field and Description
static short	BLOCK Magic for blocks.
static short	FILE_HEADER Magic cookie at start of file
static short	FREE_PAGE Magics for block types in certain lists.
static short	FREELOGIDS_PAGE
static short	FREEPHYSIDS_PAGE
static short	LOGFILE_HEADER Magic for transaction file
static long	MAX_BLOCKS Maximum number of blocks in a file, leaving room for a 16 bit offset encoded within a long.
static short	NLISTS Number of lists in a file
static short	SZ_BYTE Size of an externalized byte
static short	SZ_INT Size of an externalized int
static short	SZ_LONG Size of an externalized long
static short	SZ_SHORT Size of an externalized short
static short	TRANSLATION_PAGE
static short	USED_PAGE

Constructor Summary

Constructors

Modifier	Constructor and Description
private	Magic() Ensures no construction of this class, also ensures there is no need for final keyword above (Implicit super constructor is not visible for default constructor), but is still self documenting.

Method Summary

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

FILE_HEADER

public static final short FILE_HEADER

Magic cookie at start of file

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Constant Field Values

BLOCK

public static final short BLOCK

Magic for blocks. They're offset by the block type magic codes.

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Constant Field Values

FREE_PAGE

public static final short FREE_PAGE

Magics for block types in certain lists. Offset by baseBlockMagic

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Constant Field Values

USED_PAGE

public static final short USED_PAGE

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Constant Field Values

TRANSLATION_PAGE

public static final short TRANSLATION_PAGE

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Constant Field Values

FREELOGIDS_PAGE

public static final short FREELOGIDS_PAGE

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Constant Field Values

FREEPHYSIDS_PAGE

public static final short FREEPHYSIDS_PAGE

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Constant Field Values

NLISTS

public static final short NLISTS

Number of lists in a file

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Constant Field Values

MAX_BLOCKS

public static final long MAX_BLOCKS

Maximum number of blocks in a file, leaving room for a 16 bit offset encoded within a long.

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Constant Field Values

LOGFILE_HEADER

public static final short LOGFILE_HEADER

Magic for transaction file

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Constant Field Values

SZ_BYTE

public static final short SZ_BYTE

Size of an externalized byte

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Constant Field Values

SZ_SHORT

public static final short SZ_SHORT

Size of an externalized short

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Constant Field Values

SZ_INT

public static final short SZ_INT

Size of an externalized int

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Constant Field Values

SZ_LONG

public static final short SZ_LONG

Size of an externalized long

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Constant Field Values

Constructor Detail

Magic

private Magic()

Ensures no construction of this class, also ensures there is no need for final keyword above (Implicit super constructor is not visible for default constructor), but is still self documenting.